Someone told me while you're on them, you can't sleep because your brain will hemorrhage and you'll die. Is that true?
Nah that's complete horseshit cosmic.
And also is there any way to come down if you're having a bad trip
It's still you and your own thoughts - the mushrooms don't change who you are. You stop thinking negative thoughts like you would when you're sober - think about something nice, something funny or someone you love. Go for a walk in nature, watch a film, play some nice music.
Enjoy your trip - let the mushrooms take you where they will, they've been taking care of humans for thousands of years. They'll look after you like a baby!
